16572973961 has 2 divisors, whose sum is σ = 16572973962. Its totient is φ = 16572973960.

The previous prime is 16572973933. The next prime is 16572973973. The reversal of 16572973961 is 16937927561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15570048400 + 1002925561 = 124780^2 + 31669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16572973961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16572973897 and 16572973906.

It is not a weakly prime, because it can be changed into another prime (16572973061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8286486980 + 8286486981.

It is an arithmetic number, because the mean of its divisors is an integer number (8286486981).

Almost surely, 2^16572973961 is an apocalyptic number.

It is an amenable number.

16572973961 is a deficient number, since it is larger than the sum of its proper divisors (1).

16572973961 is an equidigital number, since it uses as much as digits as its factorization.

16572973961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4286520, while the sum is 56.

The spelling of 16572973961 in words is "sixteen billion, five hundred seventy-two million, nine hundred seventy-three thousand, nine hundred sixty-one".